The Australian mainland has been inhabited for more than 42,000 years by Indigenous Australians. After sporadic visits by fishermen from the north and by European explorers and merchants starting in the 17th century, the eastern half of Australia was claimed by the British in 1770 and initially settled through penal transportation as part of the colony of New South Wales on 26 January1788. As the population grew and new areas were explored, another five largely self-governingCrown Colonies were established during the 19th century.